Info: TCM tuning
- Thread starter ZeroGravity58
- Start date
hey tom, to answer your question about why your downshifts are not hard in tow/haul, is because the tune you have is out of a 01 tcm. try locking out overdrive(cant do it). ran that tune for while changed back to stock with 5194 changed to 40%. mine sounds like a dang 5 speed manual truck through the gears and this helped a little but i guess i need to look into the ecm tuning to fix it right.
Nope..that cant be it, because 5th gear could still be locked out. That was the one thing that always stumped me...that towhaul didnt act like towhaul, but still did what towhaul does. In looking at the parameters section, I noticed a note that said something about it being an 8.1 tune. Does that help?
I looked at a couple Trans tunes I tried before I used my current tune. One had the 5197 enabled, one didnt.
Oh hell...we're talking about EFILive and the insides of an Allison...two things I know so little about, its appalling.
Can someone please tell me how I go about offsetting the defuel in the engine tuning so the trans will shift better than it does stock?
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GMC_2002_Dmax
The Still Master
Tom,
Proper de-fuel is getting TBIQ, Base TQ, TLIQ, and main pulse w & w/o pilot correct.
The TPS% vs the Tq value and then the look-up for TLIQ is the three tables that wil get you there.
:hug:
Maybe I'll start on a spreadsheet set up that you can copy-paste the TBIQ and Base TQ table into and it would calulate TLIQ. It could have another box that you put in the % of defuel you want, then you could do it by % or you could put 0% then subtract a set number from the whole table.
GMC_2002_Dmax
The Still Master
You can try that..........let me know how that works out.
I think I already know the answer...............
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Since we're on the subject, I see how all these tables are tying together. In the torque limited injection quantity table description it says, "If the ECM is trying to limit engine torque then this table will define the commanded injection quantity value based on the torque value the ECM is trying to limit to." I haven't seen anything that determines when or by how much the ECM tries to limit torque. Without logging the torque reference, how would you know what it does during a shift?
GMC_2002_Dmax
The Still Master
So to find it you would have to log it? If so, that's what I thought.There is a TQ PID...........it is a DMA pid,
Thanks..I think.
When it comes to EFI, Im starting to think I should have paid more attention in Calculus class.:rofl:
GMC_2002_Dmax
The Still Master
You don't need any special formulas, heck I don't even know calculus, I went to trade school for Auto-Body repair.
What I do have is a lot of time spent learning how it all works and how it all ties together.
What I do have is a lot of time spent learning how it all works and how it all ties together.
You don't need any special formulas, heck I don't even know calculus, I went to trade school for Auto-Body repair.
What I do have is a lot of time spent learning how it all works and how it all ties together.
Oh, I know. I was just being sarcastic. As you said, it takes a lot of time and trial to figure things out.
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Something I just thought of....
if the defuel is back "on" in the TCM, what is that going to do to engine power? Sorry, I just dont understand this stuff.
if the defuel is back "on" in the TCM, what is that going to do to engine power? Sorry, I just dont understand this stuff.
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GMC_2002_Dmax
The Still Master
De-Fuel will do just that, or do very little, depending on how the ECM is tuned to de-fuel on a particular shift.
You can still pull very little fuel on a shift and get a clean shift, it all depends on how you set-it up.
You can still pull very little fuel on a shift and get a clean shift, it all depends on how you set-it up.
De-Fuel will do just that, or do very little, depending on how the ECM is tuned to de-fuel on a particular shift.
You can still pull very little fuel on a shift and get a clean shift, it all depends on how you set-it up.
And this is the problem i found out...some tuners dont know jack about what they are tuning but they claim to